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Old 18th October 2012, 03:36 PM   #21
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i have a pair of bipoles i listen to daily and nightly to tell the truth whenever i can .. they fill my room with not much power needed . Now i must remember to have a listen to some omnipole speakers..

kind regards Mark
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Old 20th November 2012, 09:30 PM   #22
solhaga is offline solhaga  Sweden
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Default A fast way to build a CBT

I couldn´t get my mind off of building a line array of the E60´s.
With the experience of building the design above, I realized that it would be easy to build CBTs:

Click the image to open in full size.

Click the image to open in full size.


Click the image to open in full size.

I´m trying burlap to get rid of some of the hf intermodulation.
Kanthal thread supplied the shading from 0 to 32 ohms.

I then got this frequency response in sweet spot:
Click the image to open in full size.
A curve fairly easy to adjust with Frequency Allocator.
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Old 21st November 2012, 05:38 AM   #23
solhaga is offline solhaga  Sweden
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So the line array is acting as a line source from 500 Hz, hence the 6 dB rise.
Hf cancellation kicks in at 3 kHz, despite the CBT and burlap, with a 6 dB/octave slope.

So the eq is bringing down 500 Hz to 3 kHz 6 dBs and then there´s a 6 dB/octave rise from 5 kHz.

XO is set to 250 Hz.

Any suggestions for another diffractor material than burlap?

Last edited by solhaga; 21st November 2012 at 05:41 AM.
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Old 21st November 2012, 06:50 PM   #24
solhaga is offline solhaga  Sweden
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So this is my new setup:
Click the image to open in full size.
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Old 21st November 2012, 06:57 PM   #25
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Are you planning to add some drivers for bass or just use those small black drivers on each side and slightly behind the array?
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Old 21st November 2012, 08:52 PM   #26
solhaga is offline solhaga  Sweden
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No plans for adding more bass drivers than the three aside TD15H that I have in the OB bass baffles.
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Old 28th November 2012, 08:35 PM   #27
solhaga is offline solhaga  Sweden
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Default FAST goes FA

I went to a concert the other night; Zappa plays Zappa. It was awesome, but I also focused on the PA. Up in the ceiling there were some CBTs...
Of course, that makes perfectly sense, as I was sitting in the third row to the left right in front of Sheila, I was subjected to the shaded bottom J of the CBTs. People far back were given the unshaded SPL from the CBTs.

So why do I have them in my listening room, sitting in the same sweet spot?
And why do I think that having multiple, all different in time, soundwaves will sound good?

Thanks to norman bates and Melo Theory and their patient answers to my questions in their threads, I'm now convinced that focused arrays(FA) is the way to go. Again, thank you guys!

I´ll be re-using all the components I have so far. Well except for the burlap and the Kanthal wire of course. The contraption will be almost the same, this time the curve will be concave and uniform.
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Old 30th November 2012, 10:26 PM   #28
solhaga is offline solhaga  Sweden
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Now I´m focusing on this:
Click the image to open in full size.
18 or 20 elements in an open baffle. Focal point is at 280 cm.
Sweet spot at 250 cm, sharp!
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Old 1st December 2012, 01:49 AM   #29
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Quote:
Originally Posted by solhaga View Post
I went to a concert the other night; Zappa plays Zappa.
A concert i'd really like to see. Frank said Dwezil was a better guitar player than he was.

dave
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Old 1st December 2012, 02:05 AM   #30
doorman is offline doorman  Canada
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Quote:
Originally Posted by planet10 View Post
A concert i'd really like to see. Frank said Dwezil was a better guitar player than he was.

dave
Might have been the proud poppa syndrome, but D. Zappa is no slouch.
High praise indeed!
Don
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